In the 19th century, a paleontologist named Othniel Charles Marsh competed with another paleontologist to discover the most dinosaurs in a bitter rivalry. During this he discovered two particular dinosaurs; the Apatosaurus and the similar but more famous Brontosaurus. Except there was one little problem, in his rush he thought that his Brontosaurus was a different species, but in truth was just another Apatosaurus. So in reality, the Brontosaurus never existed.